Socket shell



Patented Apr. 22, 1924.

STEIHEN S. GRADY, OF'NEWTONVILLE, MASSACHUSETTS,-ASSIGNOR TQJAY K. COHENAND SAMUEL K. COHEN, BOTH OT NEXV YORK, N. Y.

SOCKET SHELL.

i Application filed June '14,

To all whom it may concern.-

Be it known that I, STEP EN S. GRADY, a citizen of the United States,residing at Newtonville, county of Middlesex, and State ofMassachusetts, have made certain new and useful Improvements in SocketShells, of which the following is a specification, taken in connectionwith the accompanying drawings. I

- This invention relates to electric light socket shells and moreparticularly to a socket shell fora ull socket.

My invention further relates to a chain guide or horn supported entirelyon the shell, free from the insulating porcelains of the pull socketswitch mechanism, and held immovably in the chain slot in the shellwithout assistance from the cap.

My invention further relates to such a removable chain guide or hornwhich is so cured to the shell and automaticallylocked against movementthereon, simply by pressing the chain guide or horn into the chain slotof the shell at substantially right angles to the longitudinal axis ofthe shell.

My invention further relates to certain combinations, articles ofmanufacture and details of construction, which will be more fullyhereinafter described in the specification and pointed out .intheclaims.

Inthe accompanying drawing showing an illustrative embodiment of myinvention and in which the same reference numerals refer to similarpartsjin' the several. figures;

Fig. 1 is a side elevation of a pull socket employing my invention partsbeing shown in vertical section for clearer illustration;

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1;

Fig. 3 is a side elevation of my improved shell;

Fig. 4 is a side elevation of the usual, or any form of interiorporcelains in which, or on which, the pull socket switch (not shown) ismounted:

Fig. 5 is a plan view of my improved chain guide or horn;

Fig. 6 is a horizontal section, similar to Fig. 2, showing amodification in which a stop is mounted on the chain.

Prior to my invention it has been old to use pull sockets and chainguides or horns.

Some of these chain guides or horns were supported on the interiorporcelains; others were supported on the shell by more or less i923.s'er ial no. 645,253.

.cumbersome constructions, involving lugs,

ing no other means to prevent the eyelet working up verticallyin thechain slot of the shell.

.By my invention I support the chain guide or horn entirely on the shelland automatically lock it against movement, simply by pressing it intothe chain guide of the shell at substantially right angles to thelongitudinal axis of the shell. If desired to disconnect the chain guideor horn at any future time, it is merelynecessary to press the hornfirmly to one side, to spring the sides of 'thechainslot in the shell,which will then permit the horn to be withdrawnfrom the shell.

I In the illustrative embodiment of myinvention shown in the drawing 1is an elec tric pull socket having my shell 2, any suitable form of cap3, interior porcelains i and 5 with which the. switch mechanism ismounted (not shown) pull chain 6, and the usual' 'fibre insulation l7.

The metal shell 2 is'provided with the usual chain slot 7 to allow thepull'chain-fi to pass out of the shell.

In my invention I automatically look within the chain slot 7 a removablechain guide or horn 8, by simply pressing the guide or horn into thechain slot 7 at right angles to the longitudinal axis of the shell 2.

In the form of my invention shown, I provide the chain slot 7 with anenlarged opening 9, forming locking shoulders 10, 1 0. I also preferablyemploy a narrow slot 11, which is practically an extension of the slot.7, but of less width. This slot 11 is preferably employed to permit theportions 12, 12 of the shell 2 to be more easily forced or sprung apartby inserting the expanding portion 13 of the chain guide or horn 8.

This Wedge or expanding portion 13 is preferably formed as the frustrumof a cone, and is a little larger than the opening 9 in the chain slot7. It will be clear that as the conical portion 13 of the chain guide orhorn 8 is pressed into the opening 9 the portions 12, 12 of the shellwill be forced or sprung apart, the small slot 11, if used as in thepreferred construction, assists this spring action of the shell. Whenthe conical member 13 has been forced into the shell so that the wallsof the opening 9 register with the kerf 14 in the chain guide or horn 8,the walls of the hole 9 will snap into the kerf 14, and securely holdthe chain guide or horn from any movement within the chain slot. Itcannot move vertically because the shoulders 10, 10 will prevent suchmovement, so that it is obvious, from the construction, that it cannotmove in any direction. It is, however, removable by applying strongsidewise pressure, which will cause the shell walls of the opening 9 tospring apart sufficient to permit removal of the chain guide or hornwhen it is desired to remove it.

It will be seen from Fig. 1 that the chain guide or horn 8 is supportedentirely on the shell 2 and not on the insulating porcelains 4 and 5. Itwill also be seen that the cap 3 can be removed without danger of thechain guide or horn 8 dropping, or accidently working out of the slot 7,for it is supported entirely by the shell 2 without the assistance ofthe cap 3.

In Figs. 1 and 2 I have shown the pull chain 6 without a stop to limitthe retrograde movement of the switch mechanism (not shown), the stop,in such a switch, being a portion of the switch mechanism, (not shown).In some cases I may use the ordinary stop which is anenlarged ball 15,Fig. 6, engaging with the bell 16 of the chain guide or horn:

Having thus described this invention in connection with an illustrativeembodiment thereof, to the details of which I do not desire to belimited, what is claimed as new and What is desired to secure by LettersPatent is set forth in the appended claims.

What I claim is:

1. The combination of an electric light pull shell provided with a chainslot having an enlarged circular portion, a removable chain guide orhorn provided with a conical wedging surface to coo erate with thecircular portion of the chain slot and wedge or spring the walls of thechain slot away from each other and locking surfaces on the chain guideor horn to removably engage with the walls of the chain slot to hold thechain guide or horn immovably on the shell.

2. The combination of an electric light pull shell provided with a chainslot having an enlarged circular portion, a removable chain guide orhorn provided with a conical wedging surface to cooperate with thecircular portion of the chain slot and Wedge or spring the walls of thechain slot away from each other, and a kerf on the chain guide or hornto removably engage with the walls of the chain slot to hold the chainguide or horn immovably on the shell.

3. An article of manufacture for electric light pull socket comprising ahollow chain guide or horn provided with an exterior wedging surface towedge apart the sides of the chain slot of a pullsocket shell andprovided with a kerf to receive the side walls of said chain slot.

4. An article of manufacture for electric light pull socket comprising ahollow chain guide or horn provided with an exterior conical surface towedge apart the sides of the chain slot of a pull socket shell and witha kerf in the conical-surface to receive the side walls of said chainslot.

STEPHEN S. GRADY. Witnesses:

JOSEPH J. SPATL, HARRY BUCKMAN.

